Ionic electroactive polymer for organs-on-chip applications

An organ-on-chip (OoC) is a microelectromechanical (MEMS) device that aims to recapitulate in-vitro the physiology of the smallest functional unit of an organ in order to perform drug analysis or study disease models. OoCs are very complex systems that require actuation and sensing capabilities within controlled and delicate environment. The...

High-frame-rate volumetric ultrasound imaging using dedicated arrays and deep learning

High-frame-rate volumetric ultrasound imaging is highly desired to enable novel clinical ultrasound applications. However, realizing high-quality volumetric ultrasound imaging at a high frame rates (>500 Hz) is challenging. Keeping the cable count and data rate of the transducer device at a realistic level without sacrificing image quality to...

Advanced Measurement Techniques and Circuits for Array-Based Transit-Time Ultrasonic Flow Meters

This thesis describes the design, prototyping and evaluation of matrix-based clamp-on ultrasonic flow meters. Several new measurement techniques are presented as well as an Application-Specific Integrated Circuit (ASIC) designed for accurate measurement of flow velocity with matrix transducers.<br/><br/>The influence of circuit topologies on the...

High-precision Versatile Ultrasonic Flow Meters Based on Matrix Transducer Arrays

Ultrasonic flow meters are widely applied to measure flow in a variety of applications. The vast majority of ultrasonic flow meters are based on the measurement of the transit time of an acoustic pulse through the fluid. This can either be done in-line, by inserting a spool piece with ultrasonic transducers into the pipe carrying the fluid, or...

Silicon photonic micro-ring resonators to sense strain and ultrasound

We demonstrated that photonic micro-ring resonators can be used in micro-machined ultrasound microphones. This might cause a breakthrough in array transducers for ultrasonography; first because optical multiplexing allows array interrogation via one optical fiber and second because the silicon-on-insulator technology allows cost-effective...

An Axial Array for Volumetric Intravascular Ultrasound Imaging

Intravascular ultrasound (IVUS) is a medical imaging modality aimed at imaging blood vessel walls from within the vessel. Current commercial IVUS catheters are designed to yield two-dimensional cross-sectional images perpendicular to the vessel wall. By pulling the catheter back through the artery (in the ‘axial direction’), and stacking the...

Non-Destructive Inspection Techniques based on Elastodynamics: Development and Validation

Piezo-driven stages for nanopositioning with extreme stability: Theoretical acpects and practical design considerations

Low-cost smart sensor interfacing

Bipolar transistors for use in bandgap references and temperature transducers

Capacitive Position Transducers: Theoretical Aspects and Practical Applications

Reliability Related Research on Plastic IC-Packages: A Test Chip Approach : A Research in the Development of Silicon Test Dies for Measurement and Comparison of Molded IC-Package Reliability, Een onderzoek gericht op de ontwikkeling van silicium test-chips geschikt voor het meten en vergelijken van de bedrijfszekerheid van plastic IC omhullingen

Multi signal-domain modeling of solid-state transducers: A theoretical framework based on irreversible thermodynamics mixed finite elements and multigrid

Development of Capacitive Position Transducers through a Mechatronic Approach